286 
The base may be concave, straight, or even convex between its: 
lateral borders. Wall thin, granular, and perforated by numerous- 
sub-circular irregularly scattered pores. There is no epitheca. 
Costz broad, distinct, and continuous with septa. 
The calice is elliptical and shallow superficially, with a deep 
fossa ; the ratio of its major and minor axes is as 100’ to 75. 
The columella, which is deeply seated, is a slender, elongate, 
strongly incised, and perforated lamina. It rises vertically in 
the calice, and is free from the septa, except near its base, where 
the primaries are united with it by thin processes. 
The septa are slender and unequal, with the primaries slightly: 
stouter and longer than the secondaries; the tertiaries and 
quaternaries are very delicate lamin, and do not extend far into 
the calice; all are granular, and sparely perforate near the wall ; 
the convexly curved upper edges of the first two orders rise con- 
siderably above the margin of the ealice. There are six well- 
marked systems of septa, but those at the ends of the calice are 
much larger than the more central ones, and show a correspond- 
ingly fuller development of the cycles; in the former, three 
complete cycles are present, and some of a fourth; but, as in 
N. semivestita, the highest cycle is undeveloped in the more: 
central halves of the lateral systems. Normally, there is but a single: 
septum, and that by its size evidently a tertiary, between each 
pair of the central primaries, but exceptionally, as in one of the 
calices figured, there are three, viz., a tertiary and two quater- 
naries. The quaternaries present in any of the systems usually - 
bend towards and unite with the tertiary between them ; these 
two orders of septa consist, however, of such short delicate 
lamine that their junction is an inconspicuous feature of the 
calice. The two calices figured represent fossils from different 
localities, and serve to illustrate the variation observed in the 
species ; their coralla are practically indistinguishable, and only 
the better preserved of them is drawn. 
The coralla vary in height from 5 to 7 mm. Height of 
corallum figured, 6 mm. Diameters of type calice, 5-5 mm. and 
4mm. Diameters of calice in variety, 6 mm. and 4°5 mm. 
Locality.—Eocene; Shelford (type calice) many examples. 
Camperdown, Muddy Creek. The variety was collected by Mr 
Kitson at Altona Bay. 
Notophyllia aperta, spec. nov. PI. ix., figs. 4a, . 
This coral somewhat resembles. gracilis in shape, but is less. 
compressed. The base is keeled, and either straight or concavely 
curved in the direction of its longer axis. The calice is elliptical 
and widely open, but not shallow; the relation of its major to 
the minor axis is as 100 to 83. Wall stout, vermicular, and 
highly porous; numerous pores are distinguishable on the in- 
